原子层沉积氧化锌功能化碳纳米管织物及其光催化特性

Atomic Layer Deposition of Zinc Oxide on Carbon Nanotube Fabrics for Photocatalysis

以二乙基锌和去离子水为前驱体,利用原子层沉积(ALD)在自支撑碳纳米管(CNT)织物上沉积氧化锌(ZnO)对其进行了功能化;考察了ALD沉积过程中功能化织物的微观形貌、晶型结构、表面性质及光催化性能。实验结果表明,ZnO最初在CNTs表面生长为纳米颗粒,随ALD循环次数的增加,逐渐形成包覆CNTs的保形生长层,改变ALD沉积条件可精确调控氧化物在CNT织物中的负载量,CNT织物逐渐由强疏水转变为高度亲水。CNTs与六方纤锌矿结构ZnO的结合有效增强了电子转移能力,同时降低了光生电子与空穴的复合几率,ALD功能化CNT织物展现出优异的光催化降解性能,表明ALD是一种能够拓展CNT织物应用领域的灵活且有效的功能化手段。

The functionalized fabrics were fabricated using diethyl zinc and deionized water as precursors to deposit ZnO onto self-supporting carbon nanotube( CNT) fabrics by atomic layer deposition( ALD).The microstructure morphologies,crystal structure,surface properties and photocatalytic activities of the fabrics were investigated during ALD. ZnO grows on the CNTs surface as nanoparticulates initially and then forms conformal layers wrapping the CNTs with rising ALD cycles. The oxide loadings in CNT fabrics can be precisely regulated by changing ALD deposition conditions. The originally hydrophobic surface of fabrics is progressively turned to be highly hydrophilic. The combination of CNTs and hexagonal wurtzite Zn O could effectively enhance the electron transfer ability and significantly reduce the recombination probability of photo-generated electrons and holes. The ALD-modified CNT fabric exhibits excellent photocatalytic degradation performance,demonstrating that ALD is an efficient and flexible method for the functional modification of CNT fabrics.